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st: odd behavior in ado file


From   "Katsuhide Isa" <[email protected]>
To   Statalist <[email protected]>
Subject   st: odd behavior in ado file
Date   Fri, 22 Jul 2005 22:10:50 +0900

Dear Statalisters,

I wrote the following simple ado file.

/*----------myboxcox.ado----------*/
program define myboxcox
version 7
local y = exp(`1')
if `y' == 1 {
   di in gr "f = " 1
   }
else {
   local f = (`y' - 1)/ln(`1')
   di in gr "f = " "`f'"
   }
end
/*----------myboxcox.ado----------*/

It works well all in all. But it sometimes shows an odd 
behavior. 
More specifically, when typed - myboxcox 1 - (namely, setting 
the argument as 1), the result is ". "(missing?), not 1.7182818 
(=(exp(1) - 1)/ln(exp(1))).

When directly typed in the command line as 
- di (exp(1) - 1)/ln(exp(1)) -, the result is 1.7182818, 
which is just as it should be.

I don't see why such a phenomenon occurs.

Any suggestions welcome.
Thanks in advance.

K.I.
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